<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>权限管理</el-breadcrumb-item>
        <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <!-- 添加角色按钮区域 -->
        <el-row>
            <el-col>
                <el-button type="primary" @click="addRoleVisible = true">添加角色</el-button>
            </el-col>
        </el-row>

        <!-- 角色列表区域 -->
        <el-table :data="roleList" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
                <template v-slot="scope">
                    <el-row :class="['bdbottom',l1 === 0 ? 'bdtop' : '','vcenter']" v-for="(item1,l1) in scope.row.children" :key="item1.id">
                        <!-- 渲染一级权限 -->
                        <el-col :span="5">
                            <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                            <i class="el-icon-caret-right"></i>
                        </el-col>
                        <!-- 渲染二级权限和三级权限 -->
                        <el-col :span="19">
                            <!-- 通过for循环嵌套渲染二级权限 -->
                            <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                                <el-col :span="6">
                                    <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                    <i class="el-icon-caret-right"></i>
                                </el-col>
                                <el-col :span="18">
                                    <el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">
                                        {{item3.authName}}
                                    </el-tag>
                                </el-col>
                            </el-row>
                        </el-col>
                    </el-row>
                </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="角色名称" prop="roleName"></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
            <el-table-column label="操作" width="300px">
                <template v-slot="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit" @click="editRoleInfo(scope.row.id)">编辑</el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete" @click="deleteRole(scope.row.id)">删除</el-button>
                    <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-card>

    <!-- 添加角色的对话框 -->
    <el-dialog
        title="添加角色"
        :visible.sync="addRoleVisible"
        width="30%"
        destroy-on-close
        :close-on-click-modal="false"
    >
        <el-form :model="addRoleForm" :rules="addRoleRules" ref="addRoleRuleForm" label-width="100px">
            <el-form-item label="角色名称" prop="roleName">
                <el-input v-model="addRoleForm.roleName"></el-input>
            </el-form-item>
            <el-form-item label="角色描述">
                <el-input v-model="addRoleForm.roleDesc"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addRoleVisible = false">取 消</el-button>
            <el-button type="primary" @click="addRole()">确 定</el-button>
        </span>
    </el-dialog>

    <el-dialog
        title="编辑角色"
        :visible.sync="editRoleVisible"
        width="30%"
        destroy-on-close
        :close-on-click-modal="false"
    >
        <el-form :model="editRoleForm" :rules="addRoleRules" ref="editRoleRuleForm" label-width="100px">
            <el-form-item label="角色名称" prop="roleName">
                <el-input v-model="editRoleForm.roleName"></el-input>
            </el-form-item>
            <el-form-item label="角色描述">
                <el-input v-model="editRoleForm.roleDesc"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editRoleVisible = false">取 消</el-button>
            <el-button type="primary" @click="editRole()">确 定</el-button>
        </span>
    </el-dialog>

    <!-- 分配权限的对话框 -->
    <el-dialog
        title="分配权限"
        :visible.sync="setRightDialogVisible"
        width="50%"
        @close="setRightDialogClosed"
    >
        <!-- 树形空间 -->
        <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
        <span slot="footer" class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="allotRights">确 定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
    data(){
        return {
            //所有角色列表数据
            roleList:[],
            //控制添加角色对话框是否显示
            addRoleVisible:false,
            //添加角色表单数据绑定
            addRoleForm:{
                roleName:'',
                roleDesc:''
            },
            //添加输入角色的验证
            addRoleRules : {
                roleName:[
                    { required: true, message: '请输入角色名称', trigger: 'blur' },
                ]
            },
            //编辑角色表单数据绑定
            editRoleForm:{
                roleName:'',
                roleDesc:''
            },
            //编辑角色对话框是否显示
            editRoleVisible:false,
            //控制分配权限对话框的显示与隐藏
            setRightDialogVisible:false,
            //所有权限的数据
            rightsList:[],
            //树形控件的属性绑定对象
            treeProps:{
                label:'authName',
                children:'children'
            },
            //默认选中的节点Id值数组
            defKeys:[],
            //当前即将分配权限的角色id
            roleId:''
        }
    },
    created(){
        this.getRolesList()
    },
    methods:{
        //获取所有角色的列表
        async getRolesList(){
            const {data : res} = await this.$http.get('roles')

            if(res.meta.status !== 200){
                return this.$message.error('获取角色列表失败！')
            }

            this.roleList = res.data
        },
        //添加角色
        addRole(){
            this.$refs.addRoleRuleForm.validate((async valid => {
                if(!valid) return this.$message.error('添加角色失败！')
                const { data : res } = await this.$http.post('roles',this.addRoleForm)

                if(res.meta.status == 201){
                    this.$message.success('添加角色成功！')
                    this.editRoleVisible = false;
                    this.getRolesList();
                }else{
                    this.$message.error('添加角色失败！')
                }
            }))
        },
        //打开编辑用户对话框并把原有的数据填上去
        async editRoleInfo(id){
            const {data : res} = await this.$http.get('roles/'+id)
            if(res.meta.status === 200){
                this.editRoleForm = res.data
            }else{
                return this.$message.error('获取角色数据失败！')
            }
            this.editRoleVisible = true;
        },
        //编辑角色
        editRole(){
            this.$refs.editRoleRuleForm.validate((async valid => {
                if(!valid) return this.$message.error('编辑角色失败！')
                const { data : res } = await this.$http.put('roles/'+this.editRoleForm.roleId,this.editRoleForm)
                if(res.meta.status == 200){
                    this.$message.success('编辑角色成功！')
                    this.editRoleVisible = false;
                    this.getRolesList();
                }else{
                    this.$message.error('编辑角色失败！')
                }
            }))
        },
        //删除角色
        deleteRole(id){
            this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(async ()=>{
                const { data : res } = await this.$http.delete('roles/'+id)
                if(res.meta.status == 200){
                    this.$message.success('删除角色成功！')
                    this.getRolesList();
                }else{
                    this.$message.error('删除角色失败！')
                }
            }).catch(()=>{
                this.$message.warning('已取消删除')
            })
        },
        //根据Id删除对应的权限
        async removeRightById(role,rightId){
            //弹框提示用户是否要删除
            const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)

            if(confirmResult !== 'confirm'){
                return this.$message.info('取消了删除！')
            }

            const {data : res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if(res.meta.status !== 200){
                return this.$message.error('删除权限失败！')
            }
            //this.getRolesList() //重新获取数据会导致页面的重新渲染，此时下拉框被收回了
            role.children = res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog(role){
            this.roleId = role.id
            //获取所有权限的数据
            const {data : res} = await this.$http.get('rights/tree')
            
            if(res.meta.status !== 200){
                return this.$message.error('获取权限数据失败！')
            }

            //把获取到的权限数据保存到data中
            this.rightsList = res.data

            //递归获取三级节点的Id
            this.getLeafKeys(role,this.defKeys)
            console.log(this.defKeys)
            this.setRightDialogVisible = true;
        },
        //通过递归的形式，获取角色下所有三级权限的id,并保存到defKeys数组中
        getLeafKeys(node,arr){
            //如果当前node节点不包含children属性，则是三级节点
            if(!node.children){
                return arr.push(node.id)
            }

            node.children.forEach(item => this.getLeafKeys(item,arr))
        },
        //监听分配权限对话框的关闭事件
        setRightDialogClosed(){
            this.defKeys = []
        },
        //点击为角色分配权限
        async allotRights(){
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]

            const idStr = keys.join(',')
            const {data : res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})
            if(res.meta.status !== 200){
                return this.$message.error('分配权限失败！')
            }

            this.$message.success('分配权限成功！')
            this.getRolesList()
            this.setRightDialogVisible = false;
        }
    }
}
</script>

<style lang="less" scoped>
.el-tag{
    margin:7px;
}

.bdtop{
    border-top:1px solid #eee;
}

.bdbottom{
    border-bottom:1px solid #eee;
}
.vcenter{
    display:flex;
    align-items: center;
}
</style>